package worker

type interface DB {
  getAllTable()
}


type worker struct {
  db DB
}

func (w worker) doSomething() {
  w.db.getAllTable()
}

package listener

type interface DB {
  getAllTable()
}

type listener struct {
  db DB
}

func (l listener) doSomething() {
  l.db.getAllTable()
}

package msql

type mysql struct {}

func (mysql) getAllTable() {
}